Respirator filter retainer



FIG. 1 is a perspective view the new design for a respirator filter retainer.

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof, the bottom being a mirror image thereof;

FIG. 5 is a left view thereof; and,

FIG. 6 is a right view thereof.

The broken lines in the drawings illustrate portions of the respirator filter retainer which form no part of the claimed design. 

CLAIM The ornamental design for a respirator filter retainer, as shown and described. 